Do you have a non rusty back cut saw? Custom cut them. It’s not hard at all.
I baked a ham for New Years dinner. I cut with a knife to the bone to remove a ham steak from the face for breakfast, sawed through the bone with the washed fine cut back saw. Washed it in hot soapy water and rewaxed it and put it back in the garage.
Bone and wood are fairly similar to saw.
I’d bring them back since they’re frozen though and let him use the powered meat saw. Assuming he isn’t on the other side of the county. If so, set out on counter til the freeze is a softer frozen state, saw before thawed completely, rewrapped and freeze the portions to save for later.